I am in a wheelchair for 18 months now, permanent, about 60 lbs overweight now, need to lose weight.?

I can't really move my legs, certainly not to exercise. I have damaged rotator cuffs so that I can't use my shoulders or arms to exercise either. About the only thing doing well is my spirits! I'm determined to get back to a good weight, about 160 lbs as I am 5'6". I've given up alcohol, refined sugar, and drink little milk or soda, only ginger ale occasionally for an upset stomach. My diet is healthy, lots of plain potatoes, plain rice, probably not enough veggies, chicken, and eggs. No fatty food or junk food or fast food. I'm not losing an ounce. What should I do? Please don't mention any of the untested diet pills out there, as I just don't feel safe taking them. (No xenadrine, Hydroxycut etc. Thanks!